Dynamo regulators



Sept. 6, 1955 A. V. WATERS DYNAMO REGULATORS Filed Dec. 3, 1951 llllllllll United States Patent DYNAMO REGULATORS Albert Victor Waters, Perivale, Greenford, England, assignor to C. A. V. Limited, London, England Application December 3, 1951, Serial No. 259,516

Claims priority, application Great Britain December 13, 1950 1 Claim. (Cl. 317-188) This invention relates to regulators for automatically controlling the voltage of dynamos used on vehicles for supplying current to a storage battery, the regulators being of the kind responsive to both the voltage and the current generated by the dynamo, and adapted to control a resistance or resistances in the field circuit of the dynamo.

The object of the invention is to provide a regulator of simple construction which enables the desired control to be efiected in a more satisfactory manner than is obtainable with regulators of conventional construction.

The invention consists of a regulator having in combination, an iron base, three iron cores extending parallel with each other from the base, a contact-actuating armature extending over the outer end of each of the end cores and hingedly connected to the central core, a voltage winding on one of the end cores, and a current winding on the other end core, a supplementary current winding being also provided on the core carrying the voltage winding.

In the accompanying drawings:

Figure l is a part sectional front elevation of a regulator embodying the invention.

Figures 2 and 3 are diagrams illustrating two modes of use of the regulator.

Referring to Figure 1, there is provided an iron base a, and on the base are formed or secured three iron cores b, c, d extending parallel with each other from the same side of the base. To the outer end of the central core 0 are hingedly secured by spring blades e, f a pair of iron armatures g, h which respectively extend over the outer ends of the other cores b, d. The armature g carries or is adapted to actuate a movable contact i which cooperates with a fixed contact j. Likewise the other armature it carries or is adapted to actuate a movable contact k which co-operates with a fixed contact in. The fixed contacts j, m are earned by a plate 22 secured to the upper end of the central core c. The two pairs of contacts control either the same or different resistances in the field winding circuit of the dynamo in the usual manner as shown in Figure 2 or 3.

On the end core 12 is mounted a winding 0 responsive to the dynamo voltage, and on the other end core d is mounted a winding p through which (when the regulator is in use), is passed the whole, or a proportional part of the current generated by the dynamo. Also a few turns of current winding q are mounted on the core 12 carrying the voltage winding, the magnetising effect of these two windings being supplementary. I

The polarity of the current and voltage windings is similar, and the magnetic circuit of each end core 15 completed through the associated armature, middle core and the base, the two fluxes through the middle core being in the same direction.

An essential feature of the invention is the supplementary current winding q on the same pole as the voltage winding. Without this supplementary winding, the voltage required to elfect separation of the contacts responsive to the action of the voltage winding tends to rise undesirably with increasing current output from the dynamo, but by the action of the current in the supplementary winding this condition can be neutralised or restricted. The number of turns required in the supplementary winding to ensure that the voltage at which the voltage-responsive contacts shall be constant or variable only between desired limits and independent of variation in the output current of the dynamo, can readily be ascertained by trial, or calculated from known data.

In addition to the above mentioned feature, the armature g may be loaded by a blade spring r, the force which it can exert on the armature being adjustable by a screw .9 carried by the top plate n. A similar spring t and adjusting screw u is provided in combination with the other armature h.

Referring now to Figure 2, the armature of the dynamo is indicated by v and its field winding by w. In series with the field winding is arranged at least one resistance x. The resistance or resistances may be carried by the regulator, or may be otherwise arranged. In parallel with the resistance, or resistances, is arranged a circuit in which are connected the regulator contacts i, j, k, m. The regulator windings are connected to the dynamo circuit as shown, and are adapted to separate the associated contacts for bringing the resistance or resistances into action under predetermined conditions of voltage and/or current. The dynamo supplies current to a battery 2 through a conventional cut-out y. In the arrangement shown in Figure 2, the supplementary current winding q is arranged in series with the main current winding p, both winding p, q carrying the same current.

Alternatively, and as shown in Figure 3, the supplementary current winding q may be arranged in parallel with the main current winding p, and the current diverted to the winding q may be adjustable by a variable resistance 2.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

A dynamo regulator of the kind and for the purpose specified, having in combination, an iron base, three iron cores extending parallel with each other from the base with one of the cores situated between the others, a pair of independently movable contact-actuating armatures hingedly connected to the intermediate core and extending respectively over the outer ends of the end cores, a voltage winding on one of the end cores, a current winding on the other end core, and a supplementary current winding on the same core as the voltage winding, the arrangement being such that the magnetic fiuxes created by all of the windings flow in the same direction through the intermediate core.

References Cited in the file of this patent UNITED STATES PATENTS 1,153,505 Levison Sept. 14, 1915 1,993,633 Rjoflat Mar. 5, 1935 2,081,618 Dunn May 25, 1937 2,455,060 Holmes Nov. 30, 1948 

